Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 8 km or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2025
2024
2023
2022
2021
January
98.3
99
98
95
100
99
February
97.8
99
100
99
100
96
March
98.8
100
98
99
98
100
April
99.1
100
99
100
99
May
98.8
100
99
99
100
100
June
99.7
100
100
100
100
100
July
99.8
100
100
100
100
August
99.6
99
100
100
100
September
98.9
99
100
100
100
October
99.4
100
100
100
100
November
98.2
98
98
97
100
December
98.9
100
100
97
100
Average
99.0
99.6
99.2
99.0
99.4
99.4
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 5 km or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
13.6
14.9
15.0
14.0
13.3
12.8
February
14.6
15.5
16.8
14.0
14.5
14.8
March
16.2
17.6
17.8
16.1
14.9
15.1
April
18.9
20.5
17.6
18.1
17.1
May
22.7
22.6
23.6
21.8
24.3
22.1
June
27.8
29.1
27.8
26.8
29.3
28.5
July
30.1
31.1
31.6
31.0
30.1
August
30.7
31.8
30.6
31.1
31.0
September
27.3
26.8
29.6
26.8
28.0
October
23.3
23.8
25.6
23.8
21.6
November
18.7
19.1
19.3
18.6
19.1
December
15.2
15.5
16.1
17.6
14.4
Average
21.4
20.0
22.5
22.0
22.2
21.2
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2025
2024
2023
2022
2021
January
9.4
8.1
11.0
9.9
9.0
9.6
February
10.7
7.5
12.5
9.9
10.8
10.8
March
12.7
9.0
14.4
13.0
11.5
12.5
April
15.5
16.3
13.9
13.8
14.6
May
19.0
14.1
19.8
18.8
20.8
19.8
June
24.1
20.5
24.8
23.6
26.3
25.0
July
26.7
24.3
28.1
28.3
27.5
August
26.3
22.8
26.1
26.6
28.1
September
22.6
18.1
23.3
22.3
24.3
October
18.7
15.9
20.3
18.8
17.6
November
14.4
7.7
15.4
14.9
16.3
December
11.1
7.5
12.0
13.1
11.5
Average
17.2
11.9
16.2
17.9
18.2
18.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2025
2024
2023
2022
2021
January
9.3
10
10
15
3
20
February
6.2
8
6
3
7
8
March
5.3
6
4
5
6
4
April
4.4
3
10
4
5
May
4.4
2
3
14
3
0
June
1.4
1
2
2
0
0
July
0.4
1
0
0
0
August
0.8
1
3
1
0
September
2.8
5
1
9
0
October
2.9
3
5
0
4
November
9.9
7
10
12
13
December
8.2
6
6
13
12
Average
4.4
4.8
3.8
5.8
4.4
4.9
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2025
2024
2023
2022
2021
January
6.1
6
6
7
6
7
February
6.5
5
6
7
7
6
March
7.1
6
6
7
7
8
April
6.6
6
7
7
7
May
6.7
6
7
7
6
7
June
6.4
6
6
6
6
6
July
6.7
6
6
7
7
August
6.4
6
7
6
7
September
6.3
6
6
6
7
October
5.4
4
6
4
7
November
5.7
5
7
6
6
December
5.6
6
5
4
6
Average
6.3
6.0
5.7
6.2
6.2
6.6
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2025
2024
2023
2022
2021
January
072°
208°
138°
042°
146°
February
166°
193°
077°
298°
203°
March
284°
224°
239°
079°
220°
April
238°
232°
240°
209°
May
242°
235°
210°
224°
230°
June
245°
238°
245°
247°
239°
July
243°
239°
245°
242°
August
232°
243°
242°
239°
September
229°
294°
238°
235°
October
237°
229°
239°
046°
November
209°
223°
072°
170°
December
024°
119°
231°
058°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.